The federal investigation found the manlift hadn't been set on solid ground and that the hydraulic cylinder for the lift wasn't designed for load-bearing support while the boom is in operation. Investigators also said the manlift operator wasn't properly trained.

The victims were bolting a metal roof to the mill building. As their shift ended, they were preparing to ride the lift to the ground when it became unsteady. The lift basket hit the side of the mill, toppling a boom. Both men were tied off to the basket.

Management policies and procedures fell short of the company's responsibility to train employees before they are assigned to operate equipment, Acting assistant secretary of labor Richard Stickler said.